Electrical Engineering XYZ MCQs
Which of the following relays are used in protection of medium transmission lines:
- Admittance relays
- Impedance relays
- Mho relays
- Any of these
Correct answer: 2. Impedance relays
Explanation: Impedance relays are commonly used for the protection of medium and long transmission lines. They operate based on the measurement of the impedance (resistance and reactance) of the line.